/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     | Version:     4.1
    \\  /    A nd           | Web:         http://www.foam-extend.org
     \\/     M anipulation  | For copyright notice see file Copyright
-------------------------------------------------------------------------------
License
	This file is part of foam-extend.

	foam-extend is free software: you can redistribute it and/or modify it
	under the terms of the GNU General Public License as published by the
	Free Software Foundation, either version 3 of the License, or (at your
	option) any later version.

	foam-extend is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "allReduce.H"

// * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //

template<class Type, class BinaryOp>
void Foam::allReduce
(
	Type& Value,
	int MPICount,
	MPI_Datatype MPIType,
	MPI_Op MPIOp,
	const BinaryOp& bop,
	const int tag,
	const label comm
)
{
	if (!Pstream::parRun())
	{
		return;
	}

	// Removed send-received loop: use Allreduce instead.
	// HJ, 8/Oct/2016

#	ifdef FULLDEBUG
	// Check for processors that are not in the communicator
	if (Pstream::myProcNo(comm) == -1)
	{
		FatalErrorIn
		(
			"void Foam::allReduce\n"
			"(\n"
			"    Type& Value,\n"
			"    int MPICount,\n"
			"    MPI_Datatype MPIType,\n"
			"    MPI_Op MPIOp,\n"
			"    const BinaryOp& bop,\n"
			"    const int tag,\n"
			"    const label comm\n"
			")"
		)   << "Reduce called on the processor which is not a member "
			<< "of comm.  This is not allowed"
			<< abort(FatalError);
	}
#	endif

	Type sum;

	MPI_Allreduce
	(
		&Value,
		&sum,
		MPICount,
		MPIType,
		MPIOp,
		PstreamGlobals::MPICommunicators_[comm]
	);

	Value = sum;
}


// ************************************************************************* //
